| Acronym | Meaning |
| SP | Special - Spring Tide (nautical Charts) |
| MU | Mauritius (ISO 3166 Digram) - Oman (FIPS 10-4 Country Code; From Muscat) |
| JAM | Jamaica (ISO 3166 Trigram) |
| NAFLD | NonAlcoholic Fatty Liver Disease |
| USN | United States Navy |
| NACA | (U.S.) National Advisory Committee For Aeronautics (1915?1958 |
| EBW | Exploding BridgeWire |
| NOB | Norwegian Bokm?l Language (ISO 639-2 Code) |
| ACK | Acknowledge (telecommunications; Cf. NAK) |
| GAB | Gabon (ISO 3166 Trigram) |